Crank case ventilating means for internal combustion engines



1932- R. MURPHY ET AL 1,369,575

CRANK CASE VENTILATING MEANS FOR INTERNAL COMBUSTION ENGINE Filed May 12, 1926 Y 2 INVENTORZ BY I msmuss nmem inventionhasffor its object a particuflarly simple and eflicient 'means for ventilating 'the crank case ofan internal combustion in engine',whether engineis equipped with 6 anair cooling system or a water cooling systemffwhich crank caseventilating means is particularly simple and economical in con- Ustructionfland highly eficient in use and f i which addsfvery little to the engine construclotion. Thisinvention consists in the novel features and the combinations and construc- =tions hereinaftersetforth and claimed. a I 1 In, describing thisinvention reference is had to the accompanying: drawing in which like charactersrepresenticorresponding parts vyinall the views;

,Figurefll is a; side elevation of an engine i 3 provided lwith an air coolingsystem equipped with ouninvention. i

Figure 24s, a sideQelevationof a water cooled vengineequipped with our invention.

Thisinvention comprises, generally, an ini {take pipe and 0111316131 pipe communicating with the crank case above theoil level there- ]Qinandymeans for creatinga current of air Qthrough the intakeland the outlet pipe and Q through the crankcase, the intake and outlet a lpipesbeing remotefrom each other and pref- 5 {39 erably located at opposite ends of the crank case, so untrue current ofl air created travels a Upracticajllythe entirelength and width of the a; crank cas n Y 3 i I a InFidure l an air cooledengine is shown inga ifan fl mounted on'the crank shaft, a fancasingZ jhavingan upwardly extending outlet 3 and air conduit 4; communicating a :4 with theupper en dthe fan outlet 3 and lfextending over theheads of thecylinders, a and communicating with ackets l5 surroundthepcylindersl @Theffan 1 inayfbe a suctionfan It is usually a blower as in: thejEjengine used31in "the well known "I automobile) i v f Gisjtheinlet pipeifor the air, and 7 the out-.

flet *orfbreatherfi pipe, the.;pipe 6 connecting [the air CQIidHltjl and the crankcase 8 near the front end oif the crankcase and the outlet UNIV'PEDSITATES munmmmvpimgn wmn s. MARKS, onsYnAcUsE, NEW YORK, Assie-NortsnY y y y y frovrnA xLrN DEVELOPMENT CORPORATION, or srnacnsn, Nnw 0 CORPORATION onNEw, YORK,

- and blown out through the fan casing, sucin the rear of the radiator.

"providedilwith anlair cooling system includ- PAT NT OFFICE i CRAIVKCIISE YEN'LQLATIKG MEANs ron INrEnNAL' coMBusrIoN ENGINES Application filed May 12; 1926. Serial N0.-108,476.

or breather pipe 7 beinglocated at the rear end of the crank case;

Obviously the pressure in the air conduit 4 will create a draft through the intake pipe 6, the crank case 8 and outlet or breather pipe 7.

In case the fan is a suction fan so that the air is drawn upwardly through the lower ends of the jackets 5 into the air conduit 4 tion will be created in the pipe 6 so that the air is drawn in through the pipe 7, the crank case 8 and out through the pipe 6 into the air conduit and crank casing.

In Figure 2 a water cooledengine is shown in which the cooling system includes the usual fan 9 driven by the engine by means of a belt 10, this fan 9 being usually arranged 11 is the intake pipe and 12 the outlet or breather pipe, the intake pipe 11 being presented toward the fan 9 so as to receive a current of air therefrom.

In Figure 2, a valve 13 is shown which is held open by a spring 14 and which is moved towards its seat more or less as the pressure increases so that the cooling effect is restrained as the speed of the fan increases. A similar valve 13 may be located in the pipe 7, Figure 1, to be operated by atmospheric pressure against a spring 14E when the suction created by the fan 1 is sufficient so that the outside pressure will close or partly close the valve.

This crank case ventilating means is particularly advantageous in that it provides for the ventilating of the crank case and the removal of vapors therefrom without adding materially to the engine construction and it also provides a particularly simple means case particularly water.

What we claim is 2- 1. In an internal combustion engine having an air cooling system consisting of a fan at one end of the engine, a fan casing and an air conduit discharging ontothe heads of the cylinders of the engine and communicating with the fan casing, a pipe connecting the air '100 90 for preventing dilution of the crank case oil due to condensation of vapors in the crank conduit and one end of the crank case and a pipe leading from the other end of the crank case into the outer air, and a normally-open, pressure-operated, spring-pressed valve in one of said pipes.

2. An internal combustion engine having a cooling system including a fan at one endof the engine, crank case cooling means comprising an inlet at one end of the crank casearranged to receive a portion of the air current created by the fan and an outlet at the other end of the crank case, one of said conduits being provided with a pressure operated outofi valve therein.

In testimony whereof we have hereunto signed our names, at Syracuse, in the county of Onondaga, and in the State of New York, this 5th day of May, 1926.

RALPH MURPHY. EDWARD S. MARKS. 

